Investigation into the effect of bore/stroke ratio on a single cylinder two stroke opposed piston engin

• Autorzy: Alqahtani A. M. , Wyszynski M. L. , Mazuro P.

Identyfikatory

DOI

10.5604/12314005.1213529

• Języki publikacji: EN

Abstrakty

EN

Opposed-piston (OP) engine’s promising fuel efficiency has attracted the interest of automotive industry in the recent years. The opposed-piston two-stroke (OP2S) engine technology heightens this fuel efficiency benefit and offers advances in structure, power density and thermal efficiency whilst sustaining its lower cost and weight. Today thermodynamic modelling remains an indispensable and cost effective route in the development and optimisation of internal combustion engines (ICEs). To achieve this goal, the OP2S engine is simulated and validated against experimental results in AVL Boost™, which is hailed as one of the most reliable and advanced engine simulation tools. Detailed analyses of the piston dynamics, heat release, scavenging and heat transfers are highlighted in discrete sections of this paper. Having compared distinct heat release models, the Wiebe 2-Zone model emerged efficacious in replicating the heat release characteristics of the PAMAR™ engine. In comparing the numerical and experimental results, the simulation revealed minimal differences in peak pressure, peak temperature and maximum pressure raise rate, under ±2.5% differences for indicated power, IMEP, indicated thermal efficiency (ITE) and ISFC. Subsequently, confidence taken from the validated numerical model is then deployed to investigate the effect of stroke-to-bore (S/B) ratio on OP2S performance. Three combinations of S/B ratios (0.5, 1.25, and 1.69) with identical swept volume are analysed in this study. Utilisation of the validated model ensured the standardisation of intake, exhaust and the combustion systems in order to isolate the effects of S/B ratio. Results indicate that heat losses decrease with increasing S/B ratio because of the reduced surface area-to-volume in the cylinder. Consequently, an improvement in ITE and mechanical efficiency is observed with reduced ISFC for higher S/B ratios. A tendency of upsurge in combustion efficiency is also evident for higher S/B ratio due to reduced heat transfer near minimum volume of the combustion chamber.

Słowa kluczowe

EN

opposed-piston; two-stroke; AVL Boost; thermodynamic modelling

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2016
• Tom: Vol. 23, No. 2
• Strony: 9--16
• Opis fizyczny: Bibliogr. 19 poz., rys.

Twórcy

autor

Alqahtani A. M.

• The University of Birmingham School of Engineering B15 2TT, United Kingdom

autor

Wyszynski M. L.

• The University of Birmingham School of Engineering B15 2TT, United Kingdom

autor

Mazuro P.

• Warsaw University of Technology, Poland Institute of Heat Engineering tel.: [phone]

Bibliografia

• [1] Herold, R., Wahl, M., Regner, G., Lemke, J. et al., Thermodynamic Benefits of Opposed-Piston Two-Stroke Engines, SAE Technical Paper 2011-01-2216, 2011.
• [2] Iliev, S. P., Developing of a 1-D Combustion Model and Study of Engine Characteristics Using Ethanol-Gasoline Blends, Proceedings of the World Congress on Engineering, Vol. II, 2014.
• [3] Johnson, D., Wahl, M., Redon, F., Dion, E., McIntyre, S., Regner, G., and Herold, R., Opposed-Piston Two-Stroke Diesel Engine – A Renaissance, Symposium on International Automotive Technology (SIAT), 2011.
• [4] Kanagalingam, S., Thermodynamic modelling of opposed piston 2-stroke engine in AVL Boost, Preliminary Report – MEng Thesis, University Of Birmingham, 2015.
• [5] Kanagalingam, S., Thermodynamic modelling of opposed piston 2-stroke engine in AVL Boost, Progress Report – MEng Thesis, University Of Birmingham, 2016.
• [6] Lee, C., Goel, S., Babajimopoulos, A., The Effects of Stroke-to-Bore Ratio on HCCI Combustion, SAE Technical Paper 2010-01-0842, 2010.
• [7] Ma, F., Zhao, C., Zhang, S., and Wang, H., Scheme Design and Performance Simulation of Opposed-Piston Two-Stroke Gasoline Direct Injection Engine, SAE Technical Paper 2015-01-1276, 2015.
• [8] Ma, Fukang et al., An Experimental Investigation on the Combustion and Heat Release Characteristics of an Opposed-Piston Folded-Cranktrain Diesel Engine, Energies 8.7, 6365-6381, Web, 2015.
• [9] Naik, S., Johnson, D., Koszewnik, J., Fromm, L. et al., Practical Applications of Opposed-Piston Engine Technology to Reduce Fuel Consumption and Emissions, SAE Technical Paper 2013-01-2754, 2013.
• [10] Opaliński, M., Mazuro, P., Wyszynski, M., Comparison of flow performance in one and three dimensional software for modelling of opposed piston engines, Archivum Combustions, Volume 35 (1), 2015.
• [11] Opaliński, M., Rek, P., Sulikowski, P., Review of Propulsion Types in Hybrid Electric Vehicles, PhD Interdisciplinary Journal, Gdansk University of Technology, No. 1, 2014.
• [12] Pirault, J.-P., Flint, M., Opposed Piston Engines: Evolution, Use, and Future Applications, SAE International, Warrendale, PA, 2009.
• [13] Prah, I., Katrašnik, T., Application of Optimization Techniques to Determine Parameters of the Vibe Combustion Model, Strojniški vestnik, Journal of Mechanical Engineering 5511, 715-726, 2009.
• [14] Regner, G., Herold, R., Wahl, M., Dion, E. et al., The Achates Power Opposed-Piston Two-Stroke Engine: Performance and Emissions Results in a Medium-Duty Application, SAE Int. J. Engines 4(3):2726-2735, 2011.
• [15] Sandu, G., Cofaru, C., Săcăreanu, S., et al., Research of the Engine’s Speed Influence on the Intake Process of a Naturally Aspirated Engine, Bulletin of the Transilvania University of Braşov, Series I: Engineering Sciences, Vol. 4 (53) No. 1-2011, 2015.
• [16] Vassallo, A., Gopalakrishnan, V., Arrigoni, S., Cavallo, R. et al., Impact of Bore-to-Stroke Ratio Over Light-Duty DI Diesel Engine Performance, Emissions and Fuel Consumption: An Analytical Study Using 1D-CFD Coupled with DOE Methodology, SAE Technical Paper 2013-24-0013, 2013.
• [17] Venugopal, R., Abani, N., MacKenzie, R., Effects of Injection Pattern Design on Piston Thermal Management in an Opposed-Piston Two-Stroke Engine, SAE Technical Paper 2013-01-2423, 2013.
• [18] Xie, Z., Zhao, Z., Zhang, Z., Numerical Simulation of an Opposed-Piston Two-Stroke Diesel Engine, SAE Technical Paper 2015-01-0404, 2015.
• [19] Zhao, Z., Wu, D., Zhang, F., Zhang, Z., Design and Performance Simulation of Opposed-Piston Folded-Cranktrain Engines, SAE Technical Paper 2014-01-1638, 2014.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.